Improvement in apparatus tor sharpening- and gumming xaws



' waited" tate @anni dttline WILLIAM s. sPRATT, or CINCINNATI, OHIO.

Letters Patent No. 95,391, dated September 28, 1869. y

IMPROVEMENT IN APPARATUS FOR SHARPENING- AND G-IJ'MIMING- JSAVVS.

The Schedule referred to in these Letters Patent: and making pari:` of the same. Y

To all whom it may cocern Be it known that I, WILLIAM S. SPRATT, of Oincinnati, Hamilton county, State of Ohio, have invented certain new and useful 1mprovements in Apparatus for Sharpening and Gumming Sawsyand I do hereby declare the following to be a sufficiently full, clear, and exact description thereof, to enable one skilled in the vart to which my invention appertains, to make and use it, reference being had to the accompanying drawings, making part of this specification.

My invention relates to that class of apparatus in Awhich rotary emery-wl'ieels, or cutters, are used for gumming and sharpening; and consists of certain devices, which dispense with the necessity of removin g the saw from its arbor, or frame, to be gninmed or sharpened, and permit ofthe adjustment ofthe revolving wheel, while in operation, to any desired position or angle'with relation to the saw-teeth.

Inthe accompanying drawings- Figure l is a perspective view of an apparatus embodying my invention, exhibiting its application to circular saws.

Figure 2 is a detached view of the frame in which the gumrning-wheelis journalled.

The wheel or cutter A is journalled in the bearings B of the swivelling-frame C.

The spindle D has lateral motion, by sliding through the boxes B, this motion heilig governed by the handle E, (in the hands of the operaton) and the retracting-spring F.

The spindle D is fitted with a grooved pulley, G, by whiehthe wheel is driven.

The frame C is pivoted to the frame H at a a', and is provided with an are, I, slotted, as shown, by which it may be secured in any desired angle.

The frame H is fitted with slides h, and traverses vertically the swinging frame J. It is elevated and depressed by means of screw K, beVeLgearing L, and hand-wheel M.

The frame J swings on the shaft N, which is journalled in the frame O.

. The frame O is slotted at b b', and secured to the joists of the building, or otherwise, so as to be capable of lateral adjustment.

The shaft N is provided with a driving-pulley, P, which communicates with the power, and the wheel A is driven by means of belt Q, which passes, as shown, over pulley It, idler-pulley S lon frame J, idlerpulley T on sliding frame H, and from thence over pulley G on the wheel-spindle D.

This arrangement of pulleys, it will readily be seen, admits of the sliding ot" frame Hwithout changing .the length of belt A gauge, U, is fixed to the frame H, which is slotted and adjustable, in the manner shown. This gauge.

serves to adjust the position of the saw for each cnt, before the wheel is brought to bear upon it. v

In the operation of gumrning and sharpening, the wheel A is made to swingacross the saw, and, by means'of the various devices, may be adjusted in the hands of the operator universally, to shape the teeth tooth is formed to in any desired iorm. -When one suit, the frame O is permanently secured by screw V, and the 'gauge U adj usted. The whole number of teeth will then bev formed of uniform depth and shape.

I claim herein as new, and of my inventionl. lThe swinging frame J sliding frame H, and

-swivelliiig adjustable ffrauie C, constructed and arranged substantially in the manner and for thepurpose described.

2. The combination ofthe adjustable gauge U with the critter IA, sliding spindle D, and retract-ingspring F, substantially as shown and described. l

In testimony of which invention, I hereunto set my hand.

Witnesses GHAs. E. OALLAHAN, HENRY MILLWARD. 

